Optical fibre based transmission systems are an essential part of telecommunication networks. Utilization of the optical fibre 1310 nm wavelength domain has key advantages: absence of chromatic dispersion compensation, use of low cost semiconductor components like semiconductor optical amplifiers (SOAs), and by utilizing transmission parallel to the 1550 nm wavelength domain, better utilization of the legacy fibre resources is achieved. This book is devoted to applications of 1310 nm SOAs in modern fibre optic telecommunication systems. One of the most important issues when designing and building transmission systems is the cost of the network infrastructure, since the end users require delivery of high quality services at low cost. The book is intended for advanced level students, professional communication engineers and academics involved in the research and design of cost effective optical fibre communication systems. Three types of applications are studied: high speed 1310 nm DWDM transmission over short and metro distances, e. g. 4x40 Gbit/s, all optical 1310-to-1550 nm wavelength conversion as well as switching of the 1550 nm data signals by the 1310 nm SOA.

The future of AIDS, derived from monkey viruses and first documented in humans around 1959, is even more secure (from the virus's perspective). LETHALGIFT OF LIVESTOCK • Z O 9 The final stage of this evolution is represented by the major, long-established epidemic diseases confined to humans. These diseases must have been the evolutionary survivors of far more pathogens that tried to make the jump to us from animals—and mostly failed. What is actually going on in those stages, as an exclusive disease of animals transforms itself into an exclusive disease of humans? One transformation involves a change of intermediate vector: when a microbe relying on some arthropod vector for transmission switches to a new host, the microbe may be forced to find a new arthropod as well. For example, typhus was initially transmitted between rats by rat fleas, which sufficed for a while to transfer typhus from rats to humans. Eventually, typhus microbes discovered that human body lice offered a much more efficient method of traveling directly between humans ...»

The Code-Switching of Trilingual Montrealers. A Case StudyThis study is of particular interest due to the complexity of the socio-political, ethnic, and linguistic context of the setting which entails bilinguality (English and French) according to Canada' s language laws, while Quebec? s provincial laws, profess to only one official language (French). In addition, the anecdotal fact that heritage languages of certain minority groups are maintained and widely utilized by members of the specific group in Montreal, adds to the unique context in which the trilingual participants were brought up in, and currently live in. This study consists of an analysis of the codes (and code-switches) used in the participants' audio-taped conversation, obtained as data with consent, and later transcribed for analysis.2413 руб 2010 год 132 стр. мягкая обложка

Networks on Chip. Topology, Switching, RoutingInvestigation of the effect of parameters such as packet, buffer, and topology sizes on the performance of the network showed that the center of the network is loaded more than the edges.2005 руб 2009 год 92 стр. мягкая обложка

THE SEQUENTIAL ORGANISATION OF CODE-SWITCHING IN EFL CLASSROOMS. TEACHER-INITIATED AND TEACHER-INDUCED CODE-SWITCHING IN A TURKISH UNIVERSITY EFL SETTINGThe value of Ustuenel' s book is that she synthesizes research from SLA, applied linguistics, and conversation analysis and helps us to see connections among language pedagogy, EFL classroom talk, and the structures of social action. It takes the sequential organisation of code-switching at the tertiary level EFL classrooms as its subject matter. The book reviews recent findings and current theoretical positions, presents new data and interpretations, and sketches the organisation of EFL classroom talk. The book is addressed to all those involved in foreign language learning and teaching.3231 руб 2009 год 268 стр. мягкая обложка

Music of Bahananwa. History, Soundscape and Aspects of Contemporary Transmission of Sehananwa Culture through MusicThe soundscape and the learning processes involved in transmitting musical knowledge from one generation to the next is discussed, with the benefit of understanding aspects that keep the ‘dynamic' culture intact. Understanding these issues could be helpful to policy makers, curriculum planners and professionals in the cultural industries in their quest to be relevant to the course of modern-day Africa Their indigenous knowledge systems are codified in cultural practices including musical performance. This book presents an exposition into the cultural world of Bahananwa. It does so by adumbrating their history, habitat, cosmology and expected communal behavioural patterns. Literature on the culture of Bahananwa is not readily available, which means their contribution to knowledge making processes is insignificant. The study of these systems, music included, could translate into fresh modern approaches to the social sciences.2781 руб 2010 год 168 стр. мягкая обложка

Double SwitchingDouble switching is the practice of using a multipole switch to close or open both the positive and negative sides of a DC electrical circuit, or both the hot and neutral sides of an AC circuit.1392 руб 2010 год 100 стр. мягкая обложка

Transmission MediumWhile material substance is not required for electromagnetic waves to propagate, such waves are usually affected by the transmission media through which they pass, for instance by absorption or by reflection or refraction at the interfaces between media.1188 руб 2010 год 68 стр. мягкая обложка

Network Switching SubsystemIt is owned and deployed by mobile phone operators and allows mobile phones to communicate with each other and telephones in the wider telecommunications network.1188 руб 2010 год 68 стр. мягкая обложка

Lessons from Sesame Markets Market Linkages and Price Transmission in Sudan.Accordingly, for an efficient market performance to be achieved, this book recommends improving the marketing infrastructure that crucially affect the cost of transporting sesame from the production areas to the trade and export centers and providing adequate storage capacities in the production areas.1896 руб 2011 год 64 стр. мягкая обложка